nia i wondered a while..and i think whatever thing started..it must have worked for someone in the past centuries..that's how they must have started..i guess for some superstitions there was a logic back then..It hurts sometimes when people believe something different as compared to you..but sometimes we also adapt some teachings..which we later find that aren't true..so i try to refrain from commenting sometimes.
I am not sure if its related to what you asked..or if i am just blabbing :(